Campus email systems suffered intermittent interruptions throughout the day Tuesday.

IST’s website first said the problem “is believed to be MySQL related,” then pinpointed it as a network issue. Later, the diagnosis changed again: “Investigation points to a possible storage issue.”

Faculty, staff and students can track the outage on IST’s system status webpage. A 2 p.m. update said “IST staff is continuing to work on this issue. Estimated time of resolution is 2:45 PM.” A further update at 3:50 p.m. said that CalMail was returning to normal. At 4:18, more problems were reported.